On planetary torque signals and sub-decadal frequencies in the discharges of large rivers

RODOLFO G. CIONCO; PABLO ABUIN

ADVANCES IN SPACE RESEARCH

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2016 vol. 57 p. 1411 - 1425

0273-1177

We explore the arguments presented in the past linking changes in the angular momentum modulus; jLj, of the Sun?s barycentric orbit,with the discharges of Po River in Europe and Parana´ River in South America, looking for any evidence regarding to a possible underlyingphysical mechanism. We clarify the planetary effect on solar torque presenting new analyses and results; we also improve priorresults on Parana´ River?s cycles finding significant spectral lines around 6.5 yr, 7.6 yr, 8.7 yr, and 10.4 yr. We show that the truly importantdynamical parameter in this issue is the vectorial planetary torque. Moreover, following the variations of L respect to the Sun?s spinaxis of rotation (i.e., a LS relationship), we found virtually the same Parana´ River discharge peaks: 6.3 yr, 7.7 yr, 8.6 yr and 9.9 yr. Ananalysis based on Magnitude Squared Coherence and Wavelet Coherence between Parana´ River discharge and our LS relationshipshows significant, although intermittently, coherence near 8-yr periodicities. Wavelet Coherence also shows big and significant regionsof coherence inside 12?19 yr band. Our results ruled out classical tidal effects in this problem; but suggest that, if these rivers are trullyrelated to solar barycentric motion, the physical origin of this connection might be related to a working solar spin?orbit interaction.